On a film set that resembles the medieval castle of a Chinese lord, Zhu Jian is busy disrupting the world's second-largest movie industry.

The 69-year-old actor is playing the patriarch of a wealthy family celebrating his birthday with a lavish banquet. But unbeknownst to either of them, the servant in the scene is his biological granddaughter.

A second twist: Zhu is not filming for cinema screens.